C# 当插入到我的FormView时。作为GUID的主键引发转换错误
例外情况如下： 不允许从数据类型sql_variant隐式转换为uniqueidentifier。使用CONVERT函数运行此查询 我真的不确定将Convert函数放在哪里。代码隐藏页是未触及的，由空的页面组成。大多数代码都是从工具箱中拖放的。aspx页面如下所示C# 当插入到我的FormView时。作为GUID的主键引发转换错误,c#,sql,asp.net,formview,C#,Sql,Asp.net,Formview,例外情况如下： 不允许从数据类型sql_variant隐式转换为uniqueidentifier。使用CONVERT函数运行此查询 我真的不确定将Convert函数放在哪里。代码隐藏页是未触及的，由空的页面组成。大多数代码都是从工具箱中拖放的。aspx页面如下所示 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="LocalDbExample.WebForm1" %
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs"
Inherits="LocalDbExample.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FormView ID="FormView1" runat="server"
DataKeyNames="CustomerId" DataSourceID="customerSqlDataSource"
AllowPaging="True">
<EditItemTemplate>
CustomerId:
<asp:Label ID="CustomerIdLabel1" runat="server" Text='<%#
Eval("CustomerId") %>' />
<br />
Name:
<asp:TextBox ID="NameTextBox" runat="server" Text='<%#
Bind("Name") %>' />
<br />
Address:
<asp:TextBox ID="AddressTextBox" runat="server" Text='<%#
Bind("Address") %>' />
<br />
City:
<asp:TextBox ID="CityTextBox" runat="server" Text='<%#
Bind("City") %>' />
<br />
State:
<asp:TextBox ID="StateTextBox" runat="server" Text='<%#
Bind("State") %>' />
<br />
PostalCode:
<asp:TextBox ID="PostalCodeTextBox" runat="server" Text='<%#
Bind("PostalCode") %>' />
<br />
Notes:
<asp:TextBox ID="NotesTextBox" runat="server" Text='<%#
Bind("Notes") %>' />
<br />
<asp:LinkButton ID="UpdateButton" runat="server"
CausesValidation="True" CommandName="Update" Text="Update" />
<asp:LinkButton ID="UpdateCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel" />
</EditItemTemplate>
<InsertItemTemplate>
CustomerId:
<asp:TextBox ID="CustomerIdTextBox" runat="server" Text='<%#
Bind("CustomerId") %>' />
<br />
Name:
<asp:TextBox ID="NameTextBox" runat="server" Text='<%#
Bind("Name") %>' />
<br />
Address:
<asp:TextBox ID="AddressTextBox" runat="server" Text='<%#
Bind("Address") %>' />
<br />
City:
<asp:TextBox ID="CityTextBox" runat="server" Text='<%#
Bind("City") %>' />
<br />
State:
<asp:TextBox ID="StateTextBox" runat="server" Text='<%#
Bind("State") %>' />
<br />
PostalCode:
<asp:TextBox ID="PostalCodeTextBox" runat="server" Text='<%#
Bind("PostalCode") %>' />
<br />
Notes:
<asp:TextBox ID="NotesTextBox" runat="server" Text='<%#
Bind("Notes") %>' />
<br />
<asp:LinkButton ID="InsertButton" runat="server"
CausesValidation="True" CommandName="Insert" Text="Insert" />
<asp:LinkButton ID="InsertCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel" />
</InsertItemTemplate>
<ItemTemplate>
CustomerId:
<asp:Label ID="CustomerIdLabel" runat="server" Text='<%#
Eval("CustomerId") %>' />
<br />
Name:
<asp:Label ID="NameLabel" runat="server" Text='<%#
Bind("Name") %>' />
<br />
Address:
<asp:Label ID="AddressLabel" runat="server" Text='<%#
Bind("Address") %>' />
<br />
City:
<asp:Label ID="CityLabel" runat="server" Text='<%#
Bind("City") %>' />
<br />
State:
<asp:Label ID="StateLabel" runat="server" Text='<%#
Bind("State") %>' />
<br />
PostalCode:
<asp:Label ID="PostalCodeLabel" runat="server" Text='<%#
Bind("PostalCode") %>' />
<br />
Notes:
<asp:Label ID="NotesLabel" runat="server" Text='<%#
Bind("Notes") %>' />
<br />
<asp:LinkButton ID="EditButton" runat="server"
CausesValidation="False" CommandName="Edit" Text="Edit" />
<asp:LinkButton ID="DeleteButton" runat="server"
CausesValidation="False" CommandName="Delete" Text="Delete" />
<asp:LinkButton ID="NewButton" runat="server"
CausesValidation="False" CommandName="New" Text="New" />
</ItemTemplate>
</asp:FormView>
</div>
<asp:SqlDataSource ID="customerSqlDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT * FROM [Customers]" DeleteCommand="DELETE FROM
[Customers]
WHERE [CustomerId] = @CustomerId" InsertCommand="INSERT INTO [Customers]
([CustomerId], [Name], [Address], [City], [State], [PostalCode], [Notes])
VALUES (@CustomerId, @Name, @Address, @City, @State, @PostalCode, @Notes)"
UpdateCommand="UPDATE [Customers] SET [Name] = @Name, [Address] = @Address,
[City] = @City, [State] = @State, [PostalCode] = @PostalCode, [Notes] =
@Notes
WHERE [CustomerId] = @CustomerId">
<DeleteParameters>
<asp:Parameter Name="CustomerId" Type="Object" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="CustomerId" Type="Object" />
<asp:Parameter Name="Name" Type="String" />
<asp:Parameter Name="Address" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:Parameter Name="State" Type="String" />
<asp:Parameter Name="PostalCode" Type="String" />
<asp:Parameter Name="Notes" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="Name" Type="String" />
<asp:Parameter Name="Address" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:Parameter Name="State" Type="String" />
<asp:Parameter Name="PostalCode" Type="String" />
<asp:Parameter Name="Notes" Type="String" />
<asp:Parameter Name="CustomerId" Type="Object" />
</UpdateParameters>
</asp:SqlDataSource>
</form>
</body>
</html>
我认为，由于CustomerID是自动生成的，因此需要将其从“插入参数”中删除：
数据库中CustomerId的数据类型是什么？UniqueIdentifier，在显示数据或向表中插入新数据时出现错误？这是一个SQL问题这是您需要的：
。GUID值与普通字符串不同，请正确处理它们。
CREATE TABLE [dbo].[Customers] (
[CustomerId] UNIQUEIDENTIFIER DEFAULT (newid()) NOT NULL,
[Name] VARCHAR (50) NOT NULL,
[Address] VARCHAR (50) NOT NULL,
[City] VARCHAR (50) NOT NULL,
[State] VARCHAR (50) NOT NULL,
[PostalCode] VARCHAR (50) NOT NULL,
[Notes] VARCHAR (MAX) NULL,
PRIMARY KEY CLUSTERED ([CustomerId] ASC)
);
<InsertParameters>
<asp:Parameter Name="CustomerId" Type="Object" /> <-- remove